How to Merge PDF Files into One Document Online
Combine multiple PDFs into a single file for free — reorder pages, then download. Runs 100% in your browser.
Why you need to merge PDFs
Almost every workflow ends up with a handful of separate PDFs that should be one: a contract and its signature page, several invoice files for an expense report, or multiple scanned pages that came out as individual files.
Sending many attachments instead of one combines awkwardly and looks unprofessional. Merging them into a single PDF is the clean fix.
Merging PDFs without uploading
The PDF Merger combines files locally in your browser using pdf-lib, a battle-tested JavaScript library. After you drop your files in, reorder them by drag-and-drop, and hit merge, the combined document is assembled on your device and offered as a download.
Because nothing is uploaded, it works in a couple of seconds even for large sets — and it's completely safe for confidential documents.
Ordering matters
Before merging, double-check page order. Merging concatenates documents end-to-end, so the sequence you add files in is the sequence that appears in the result.
Some tools only support simple concatenation. The PDF Merger lets you drag each file into the exact position you need before combining.
Try it free — PDF Merger
Add several PDFs, re-arrange their order with up/down controls, and merge them into a single PDF right in your browser.
Open PDF Merger